With Scan Tool

NOTE: It may be necessary to service non-EEC faults before running the Quick Test.
Deviation from this procedure may cause false codes.
1. START engine and bring up to operating temperature.

IF ENGINE WILL NOT START, see No Start Symptom Test. No Start Symptom Test

2. Turn the key "Off", wait ten seconds.

3. ACTIVATE the Self Test (refer to scan tool manufacturer's owner's manual for instructions).

4. Turn ignition key "Off".

5. Record all codes received.

6. Turn the ignition key "Off" and "Deactivate" the self-test.

IF NO CODES ARE STORED AND ENGINE STARTS, see Key On Engine Running (KOER) Self Test. Key On Engine Running (KOER) Self-Test

IF ANY CODES ARE RECEIVED, see Erase and Retest. Clearing Diagnostic Trouble Codes

IF SCAN TOOL TESTER ALWAYS DISPLAYS STO LO OR VOM ALWAYS DISPLAYS 0 VOLTS, see STI - Self Test Input. STI - Self Test Input

IF NO CODES ARE RECEIVED AND ENGINE DOES NOT START, see No Start Symptom Test. No Start Symptom Test